How to forward GoDaddy email to Gmail with Non GoDaddy DNS

On average, how many emails would you say are forwarded from your ServerBeach server to Google?

Do you have reverse DNS set up correctly with a matching "A" record for your ServerBeach Server? You can test that by doing an nslookup, but using your server's IP address for the query. I'm not sure how much you know about DNS so let me give you a brief overview:

• An A record associates a domain name to an IP (so google.com's A record would be 1.2.3.4, for example.)
• A Reverse DNS record does the opposite - so a query for 1.2.3.4 would return "google.com" to continue the previous example.
• Most of the time, rDNS is irrelevant. However, some mail servers (google for example) like to see a matching rDNS record as an indication that you're not a spammer. Having an incorrect or mismatching rDNS record could cause your mail to bounce.

Sending too many messages or misconfigured DNS could cause you to be tagged as a spammer.

Also, head over to CheckOR.com and test to see if your mail server is an "Open Relay," meaning that anyone can use your server to send email to whoever they want (That's bad - and spammers have tools to scan for open relays to use them to send their spam.)

You've covered things pretty well there, apart from the redirection of your domain.com address to force.com. According the the RFC's you should not use a CNAME for the root record of your domain, so what you should really be doing here is creating an A record for domain.com, that points to the IP of your hosting at force.com, and configure that to serve pages for that URL.